The structure of withControlPanel is wrong,

You should write like this : 

var KanbanViewWithoutControlPanel = KanbanView.extend({

withControlPanel: false

});

You can find the structure of related parameters from this path :

/odoo/addons/web/static/src/js/views/abstract_view.js

Ravi,

Thank you for your answser and pointing out the correct documentation.

Unfortunately it does not work : the control panel is still there. Here's what I'm doing 

odoo.define('my.KanbanViewWithoutControlPanel', function (require) {
 "use strict";

 var viewRegistry = require('web.view_registry')
 var KanbanView = require('web.KanbanView')

 var KanbanViewWithoutControlPanel = KanbanView.extend({
 config: _.extend({}, KanbanView.prototype.config, {
 withControlPanel: false,
 }),
 });

 viewRegistry.add('kanban_without_control_panel', KanbanViewWithoutControlPanel) 
});

And in my view

<kanban js_class="kanban_without_control_panel">...

There is no error. The js file is correctly loaded.

I modified the JS to print out the current view in the console .

        init: function (viewInfo, params) {
            this._super.apply(this, arguments);
 console.log(this)
        },

The output shows that the view is called, but the control panel is still enabled:

arch: {…}
​​
attrs: {…}
​​​
​​​
create: "false"
​​​
js_class: "kanban_homepage"
...
withControlPanel: true
​
withSearchPanel: true

So ma temporary solution (wrong ?) is to set this 2 variables in the init method.

Regards

extend kanban view using "js_class" attribute (https://www.odoo.com/documentation/13.0/reference/javascript_cheatsheet.html#customizing-an-existing-view)

override  withControlPanel to false

<kanban js_class="kanban_without_control_panel">